The mOmma feeding bottles feature the unique Natural Wave Peristaltic teat that is clinically proven to help maintain established breastfeeding patterns. Based on over 50 years of research into infant feeding behaviour, this teat has been developed to promote the natural sucking style of babies. Super soft and flexible for optimal compression, this 100% silicone teat has an Air Ventilation System that reduces intake of air, a potential cause of colic. The round ergonomic shape makes it easy and comfortable to hold, while the wide neck design means that they are easy to fill and clean. The bottles feature protective covers for leak free, hygienic milk storage while on the go. The innovative rocking movement entertains baby and captures his attention, making mealtime more enjoyable for baby and parents! The mOmma BPA free feeding bottles are interchangeable with the mOmma Non spill and Straw cup lids.